I would go over the connectors once again, i have found issues on 2nd look around before, have you checked ignition switch inside, broken or partially broken cable inside is a trick of the mk1 particularly, i guess you probably checked this already though..
Ignition switch meters out well and I also bypassed it electrically whilst still keeping the key in for the immobiliser. Apart from the rotten connection on the FI pump cable from the inhibit relay falling out on me when I was starting my checks after it broke down the connectors are in much better nick than I imagined..
Has the bike got an immobilizer? Fitted as standard 2004 on, I had a problem with mine the connection between the key and immobilizer which fits over the ignition switch had dodgy connections not helped with other keys on the same keyring.
Yes it has an immobiliser. I even bought a Yamaha immobiliser bypass device that plugs in under the tank on the other mating plug to the keywitch immobilers ring which had some very funny effects. The fact that the inhibit relay comes on ruled that out really.
I have gone through it all again, got decent sparks all round once I put a cover over myself and bike and created a darker area. Got injectors pulsing, FI pump and cutoff work, all sensors clear on DIAG and also testing. My main focus was on cam sensor but on turning the flywheel round by hand I am getting everything arrive as it should, probably not at the same time as the pistons want it too though.
I am now, after reading through the forum, leaning towards something mechanical like cam chain jump, especially as I remember how the whole sorry story started. I started the bike after stopping to get something from the local shop where it had been fine all morning. It ran very briefly and stopped suddenly and I always thought I had heard something from top of the engine. It never ran again. I suspect it may have jumped a tooth or two especially after reading about other who have had the same here.
Next stage is get the rocker cover off and look at timing chain, timing and adjuster. Spent too long beating myself up with management, ECU, FI etc. It's not that it all happening in that dept.
Oh, and after all that I bought another Niner this afternoon.
And once again thanks to all who have kindly contributed over the last week, useful cam and timing tips and thoughts welcomed.
Edited by Fenestrom, 08 November 2021 - 08:56 pm.